What Federal Overtime Law Actually Requires
The Fair Labor Standards Act requires nonexempt employees to be paid at least one and a half times their regular rate for every hour worked beyond 40 in a workweek. That is the national floor, not the ceiling. The 2024 DOL rule that would have raised the salary threshold for exemption was vacated nationwide by a federal court, so the familiar $684 per week ($35,568 per year, $107,432 for highly compensated employees) benchmark from the 2019 rule still governs exemption screening.
Two words carry most disputes: worked and workweek. Hours worked include time an employer knew or should have known you worked, including off-the-clock prep, mandatory security checks, and travel between sites mid-shift. The workweek is a fixed 168-hour window that stands on its own — a 46-hour week pays 6 OT hours even when next week is 34, which trips up biweekly payroll setups constantly.
The math looks trivial until real pay stubs appear. At $22 per hour with 46 hours, straight time is $1,012 and the OT premium adds $66, for $1,078 total. Push the same week to 60 hours and total pay reaches $1,540, because the last 20 hours each earn $33. Ten steady OT hours a week at that rate is $330 weekly — $17,160 over a year — which is why misclassification cases are worth real money. For a quick annual view across a full schedule, the hourly to salary with overtime calculator extends this math.
The Regular Rate Is Rarely Just Your Base Wage
The regular rate used for overtime is a legal construct: total compensation for the workweek divided by total hours worked, minus specific exclusions. Nondiscretionary bonuses, shift differentials, commissions, and piece-rate earnings must be included. A promised production bonus or an attendance bonus is nondiscretionary no matter what the employer calls it, because employees can expect it and it depends on hours, efficiency, or output.
The bonus does not just get added to the check — it lifts the OT rate. Suppose you earn $22 per hour, work 46 hours, and land a $100 weekly production bonus. The bonus spreads across hours at $2.17, making the regular rate $24.17 and the OT rate $36.26. Total pay is $1,184.52, not the $1,178 you would see if the bonus were paid flat on top. On $5,000 of quarterly production bonuses across a 48-hour schedule, that spread is the difference between compliant payroll and a class claim.
Shift differentials run through the same pipe. A $1.50 night differential on every hour of a 46-hour week raises the regular rate to $23.50 and weekly pay to $1,151.50. The practical check: recompute your OT rate with every recurring payment included, then compare with the stub. The hours pay calculator runs the gross-pay side of that check for single-rate weeks.
Blended Rates When One Week Spans Two Pay Rates
Work 20 hours as a $22 warehouse picker and 25 hours as a $30 forklift operator for the same employer, and your overtime rate is neither $33 nor $45. Under 29 CFR 778.115, the employer computes a weighted average: $1,190 of straight time across 45 hours gives a blended regular rate of $26.44, and the 5 hours past 40 earn a $13.22 premium each — $66.11 on top of straight time, $1,256.11 total. Employers may pay OT at the highest rate worked as a courtesy, but the blended rate is the legal minimum.
The shortcuts fail in both directions. Paying the premium at the lower rate yields $1,245.00 — $11.11 short per week, roughly $578 a year at that schedule. Bonuses ride along too: add a $150 weekly bonus to the same two-rate week and the blended rate climbs to $29.78, lifting the premium to $74.44 and total pay to $1,414.44.
Blended-rate errors cluster in industries where staff float between departments — hospitality, healthcare float pools, manufacturing, and retail covering neighboring stores. If your schedule shows two rates in one week, run mode 2 of this calculator with both rates and the bonus, and compare the blended premium against the OT line on your pay statement.
Double Time, Holidays, and Premium Contracts
Federal law has no double-time requirement. Double time exists by contract — union agreements, employer handbooks, or state rules like California's time-and-a-half past 8 hours and double time past 12 in a day. This calculator takes extra double-time hours at 2x in mode 1, so a 40-hour week plus 8 holiday hours at $22 pays $1,232 rather than the $1,144 that 1.5x would give — an $88 difference per holiday shift.
Sunday premiums, sixth-day premiums, and holiday multipliers all flow through the same regular-rate machinery when they are tied to hours worked. The one trap worth knowing: premium pay at 1.5x or higher for working a holiday can sometimes be credited toward overtime liability under 29 U.S.C. 207(h) — if the premium is at least 1.5x and the hours it covers are OT hours. Ask payroll which method they use before assuming the credit was wrong.
If your week is mostly a schedule problem rather than a rate problem, plan the hours first. The time card calculator totals daily punches across a week and flags the hours past 40 that feed this calculator.
The Fluctuating Workweek Method, Explained Properly
Salaried nonexempt employees with genuinely swinging hours can be paid OT the half-time way. The fixed salary is treated as covering straight time for all hours worked in the week, whatever their number, and each OT hour adds half the derived regular rate. An $865 salary over 50 hours yields a $17.30 rate, so 10 OT hours cost the employer $86.50 in premium and total pay of $951.50. At 55 hours the rate drops to $15.73 and total pay is $982.95 — the effective OT rate fell to $8.65 because the same salary stretched across more hours.
The method is legal only with guardrails: a clear mutual understanding before work is performed, a salary that stays fixed even in short weeks, hours that genuinely fluctuate both above and below 40, and the half-time premium paid on top. The April 2020 DOL rule also confirmed that bonuses and incentive payments may be added without killing the method, though they must be included in the regular rate. Employers who quietly switch staff to half-time OT without the agreement, or who cut the salary in light weeks, lose the method entirely.
For the worker, FWW means heavy weeks are cheap for the employer and every extra hour dilutes your effective rate. If your salary is $865 and you routinely work 55, your blended weekly equivalent is $17.87 an hour — under the $20.29 you would effectively earn at 45 hours. Run mode 3 at your own typical week before accepting or renegotiating an FWW arrangement, and sanity-check the annual picture with the gross to net calculator.
State Rules That Beat the Federal Floor
About a dozen states add daily overtime or lower weekly triggers. California pays 1.5x past 8 hours in a day and double time past 12, plus premiums on the seventh consecutive day — the California overtime calculator handles those daily tiers. Colorado adds 1.5x past 12 hours in a day, Alaska past 8, Nevada for employees earning under roughly 1.5x minimum wage, and Minnesota uses a 48-hour weekly trigger.
State-specific minimum wages also change the math for tipped and low-wage staff, since the regular rate can never sit below the applicable floor with tips credited correctly. Florida's $15.00 floor with its $3.02 tip credit changes the OT cash rate each step of the way — the Florida overtime calculator models it. Illinois and New York layer their own rules, with New York's spread-of-hours rule adding an extra hour at minimum wage when the workday spans more than 10 hours — the Illinois overtime calculator and New York overtime calculator cover those.
Where state law is silent, federal law governs in full. Georgia is the classic case: no state overtime statute at all, so everything runs on the FLSA — the Georgia overtime calculator shows the pure federal computation. When two rules could apply, the employee gets whichever pays more, never an average of the two.
Payroll Mistakes That Quietly Cost Workers Money
Averaging across weeks is the most common violation. An employee paid biweekly who works 50 hours then 30 at $22 should get $1,210 plus $660 — $1,870. Paying all 80 hours flat produces $1,760, a $110 loss in a single pay period. The same trap appears in two-week schedules, 9/80 schedules, and on-call arrangements that blur where one workweek ends.
Rounding is the second leak. Federal regulations allow rounding to the nearest five minutes only when it averages out; systems that round start times down and end times up systematically shave minutes. Automatic lunch deductions cause the same injury when the employee works through lunch. Twenty shaved minutes a day is 1.67 hours a week — at an OT-adjacent schedule that compounds past $2,000 a year.
Then there is the misclassification family: OT-exempt titles with nonexempt duties, independent contractor labels on controlled schedules, and comp time in the private sector. Each carries the same remedy — unpaid OT for two years, three if willful, with liquidated damages that can double the award. If you want the payroll-tax side of the correction once back pay lands, the FICA tax calculator shows what comes out of it.
Overtime, Taxes, and Take-Home Planning
Overtime is taxed exactly like regular wages at filing time. The belief that OT 'goes all to taxes' comes from withholding software: a check with double the normal hours gets annualized, pushing that single check's withholding into higher bracket rows. The extra withholding is a timing artifact, repaid at refund time. Marginal-rate math still matters — a worker in the 22% bracket keeps 78 cents of every OT dollar, plus whatever state income tax applies.
For planning, look at weekly OT as an annualized raise. Steady 10-hour weeks at $22 add $17,160 in annual gross pay, which is often the cheapest lever a household has for debt payoff or emergency funding. The tradeoff is real: at 60-hour weeks the marginal fatigue cost is steep, and the effective hourly rate of the 55th hour — after taxes and commuting — can look closer to base wage than to 1.5x.
Paycheck-frequency effects matter too. Biweekly pay produces two 3-paycheck months a year, and OT weeks do not land evenly — hold back a buffer from heavy checks rather than annualizing them. Once the gross side is settled, run the net side separately: pre-tax deductions like Section 125 health premiums come out before FICA, which is why two identical gross checks can still clear different amounts.
Checking Your Employer's Numbers Line by Line
Pull one pay stub that includes overtime and rebuild it: hours at each rate, any bonus or differential, the blended or adjusted regular rate, and the premium line. Mode 1 covers single-rate weeks with a bonus fold and double-time hours; mode 2 covers two-rate weeks on the 778.115 blended method; mode 3 covers fluctuating-workweek salaries. The explanation panel prints every component so a mismatch with the stub is easy to localize.
When numbers disagree, ask payroll first in writing — many gaps are configuration errors, like a bonus excluded from the regular rate or a differential coded as a reimbursement. If the answer does not hold up, a wage claim with your state labor agency or the U.S. DOL Wage and Hour Division is free, retaliation for filing is separately illegal, and records you kept (schedules, texts, punch screenshots) carry real evidentiary weight when the employer's records are missing.
Keep the check small and current. The two-year lookback means a payroll error found early is an inconvenience; found three years late it is a fight over stale evidence and departed managers. A five-minute monthly rebuild of one OT week with this calculator is the cheapest audit you will ever run.